Abstract: The ultra-thin rear projection display device described herein includes a wide angle lens system and one or more planar mirrors that are parallel to a screen on which an image is to be displayed. In one embodiment, the screen that has multiple groove angles to provide better illumination than screens with a single groove angle.

Abstract: An optical screen panel and a method of making an optical screen panel is disclosed. The panel includes layers or rows of alternating, or interleaved, light transmitting and light blocking or opaque elements, and is extruded. The layers or rows are in the form of relatively small ribbon elements which are generally parallel to the direction of viewing, and thus generally perpendicular to the front plane of the panel itself, which is the viewing surface of the panel. Several embodiments are shown, including panels with light directing elements and light scattering elements. The light directing and scattering elements may be embossed in the extruding process or they may be extruded as separate layers and secured to the layered panel post extruding. Angled and curved layers are among the several embodiments. Ultra violet protection may also be provided to the optical screen layered panel. When no light source is “on,” and thus no light is being transmitted, the optical screen panel appears opaque.

Abstract: An optical structure and method for forming same includes a plurality of first cured portions and a plurality of second cured portions that are formed from a same light-curable material. The first plurality of cured portions is cured to a first amount. The plurality of second cured portions is cured to a second amount. The first amount is sufficiently different than the second amount to result with discontinuities on the surface of the structure. The lenticular layer can include a prism layer having random discontinuities on the peaks. The discontinuities can also be formed on a window side of the prisms.

Abstract: According to the invention, elements 71 distributed over one and the same diopter allow both macrocollimation and microfocussing by reflecting the light rays projected onto this screen; refractive elements 72 may also be distributed over this diopter.

Abstract: A brightness enhancement film includes a top surface, a bottom surface and a plurality of brightness units arranged to form an array on the top surface. The brightness unit is consisted of a first cured surface and a second curved surface. Each of the first cured surface and the second curved surface is extended downward to terminate at a curved bottom edge so as to form a uniform curvature of the curved surface.

Abstract: An image display apparatus comprises a hologram screen 2 formed by bonding a hologram element 20 to light-transmissible films 21 and an illumination device 11 for irradiating image light 10 onto the hologram screen and reproducing an image on the hologram screen 2. The light-transmissible film 21 positioned on the irradiation side of the image light 10 relative to the hologram element 20 has an angle deviation of not greater than 45 degrees between a direction of the light-transmissible film 21 that gives the highest thermal shrinkage ratio and an axial direction in the hologram screen 2. Therefore, the image display apparatus can provide high-quality images without the superposition of an interference pattern on the images on the hologram screen.

Abstract: An optical device such as an overlay panel for a LCD display, comprises an element of light-transmitting material having a surface configured to form a stepped Fresnel prismatic structure. The light-transmitting material itself or ribbed light refracting element, said element incorporates an array of graded refractive index features adapted to impart light dispersing of diffusing characteristics to the light-transmitting material. In an alternative arrangement, the element of light-transmitting material has a layer configured to form a stepped Fresnel-type surface and an additional layer incorporating such an array of graded refractive index features.

Abstract: A projection device comprises a projector (1) for providing a light beam (3, 13) to be projected in polarized light. A adjustable liquid crystal element (4) for changing the direction of polarization is arranged between the projector (1) and the transmissive projection screen (2). The transmissive projection screen (2) comprises a polarizing diffusion layer (9). The extent of changing the direction of polarization by the adjustable liquid crystal element (4) for changing the direction of polarization is adjustable. The extent of changing the direction of polarization and hence the extent of diffusion in the transmissive projection screen (2) is adjustable by way of adjusting the voltage from a voltage source which is coupled to the adjustable liquid crystal element (4) for changing the direction of polarization.

Abstract: A multidirectional single surface optically shaped film is disclosed. The optically shaped film may include a film having only one surface structure with two or more different, overlapping Fresnel patterns formed in the structured surface for use as thin, decorative film.

Abstract: An image system includes a screen and a beam generator. The screen has first and second regions with adjustable brightness levels. The beam generator directs first and second electromagnetic off beams and first and second electromagnetic on beams onto the first and second regions, respectively. The first and second off beams respectively change the brightness levels of the first and second regions according to a first polarity, and the first and second on beams change the brightness levels of the first and second regions according to a second polarity. For example, the system may simultaneously scan multiple tiles of an image onto respective regions of the display screen with respective image (on) beams, and erase the regions with respective erase (off) beams. Scanning an image as multiple tiles often provides the image with a higher resolution for a given scan rate, and using on and off beams often increases the quality of the image.

Abstract: Disclosed are a base plate for use for a lens sheet that can realize the unlikeliness to be cracked while the self-sustenance of the lens sheet is being maintained, the lens sheet, and a projection screen comprising that lens sheet. In a base plate, the base plate constructing a lens sheet as a base sheet for a UV-curable resin layer by being bonded to the UV-curable resin layer and being made of ductile materials, the breaking flexure by bending of the ductile material is 0.08 or more; and the Izod impact value thereof is 5 KJ/m2 or more. Also, in a base plate consisting of fragile material, there is used a material that has respective physical properties wherein when it is assumed that F (MPa) represents the shearing force of the UV-curable resin; h (m) represents the thickness of the base plate; E (MPa) represents the bending modulus of elasticity of the fragile material; and &ohgr; (dimensionless quantity) represents the breaking flexure by bending, the relationship of F/hE&ohgr;<1.5 holds true.

Abstract: Disclosed is a rear projection screen that includes a plurality of tapered waveguides and a light absorbing layer disposed over the tops of the waveguides, but that does not completely fill the spaces between the waveguides, thereby forming an interstitial low index region under the light absorbing layer and between the waveguides. The low index interstitial region can include air or a material that has a lower index of refraction than the waveguide material. This rear projection screen construction can give rise to increased efficiency and higher contrast, as well as allow for more design freedom in constructing screens that have desired characteristics such as viewing angle, viewing asymmetry, and the like. Also disclosed are methods for making the described microstructured rear projection screen.

Abstract: In a lens sheet, a lens portion made if activation energy curing resin such as ultraviolet curing resin has a plurality of lens units, the lens portion is disposed on at least one side of a transparent substrate such as plastic sheet, a relaxation layer is disposed between the transparent substrate and the lens portion, and the thickness of the relaxation layer is within a range of 1% to 30% of the height of the lens units. The relaxation layer is made of activation energy curing resin and formed integrally with the lens portion. The refractive index of the transparent substrate is lower than that of the lens portion. The lens units are elongated prisms each having a substantially triangular cross section.

Abstract: An optical screen panel and a method of making an optical screen panel is disclosed. The panel includes layers or rows of alternating, or interleaved, light transmitting and light blocking or opaque elements, and is extruded. The layers or rows are in the form of relatively small ribbon elements which are generally parallel to the direction of viewing, and thus generally perpendicular to the front plane of the panel itself, which is the viewing surface of the panel. Several embodiments are shown, including panels with light directing elements and light scattering elements. The light directing and scattering elements may be embossed in the extruding process or they may be extruded as separate layers and secured to the layered panel post extruding. Angled and curved layers are among the several embodiments. Ultra violet protection may also be provided to the optical screen layered panel. When no light source is “on,” and thus no light is being transmitted, the optical screen panel appears opaque.

Abstract: A resin lens plate has, on its planar surface, convex lenslets arranged in a regular pattern with adjacent lenslets being apart from each other by a specified center-to-center pitch. Each of the convex lenslets has a rectangular or hexagonal contour in a plan view of the plate, and the lenslets are arranged such that the direction in which the center-to-center distance between adjacent lenslets takes a maximum value is in parallel with the lengthwise side of the plate. A groove or a ridge is formed along the bisector of a center-to-center line drawn between each pair of adjacent lenslets, and a light absorbing film is formed over the groove or the ridge. The groove or ridge inhibits the entry of stray light to the lenslet from adjacent lenslets.

Abstract: An automatic optical reading apparatus (1) having a light emitting section (26), a light receiving section (27) and an outside interface section (36). A first unit (2) houses at least one of the emitting section (26) and the receiving section (27) and a second unit (3) houses at least the outside interface section (36). The first unit (2) and the second unit (3) are mutually connectable in at least two different mutual orientations.

Abstract: A spatially modulated light beam is projected, reflected, and redirected through a prismatic optical panel to form a video image for direct viewing thereon.

Abstract: A light diffusing screen is made by exposing a photopolymerisable material to polymerising light through a mask having an array of light-transmitting apertures in an opaque background or vice versa, at least some of the light being directed obliquely onto the photopolymerisable material. The resulting photopolymerised material has asymmetric light diffusing properties. In some embodiments two beams of light directed onto the photopolymerisable material are equally and oppositely inclined to the perpendicular to the plane of the material. An analogous effect may be provided, in other embodiments, by exposing the photopolymerisable material to light converging conically on the photopolymerisable material.

Abstract: A privacy screen, an image separating screen suitable for creating stereoscopic images, and an image interlacing screen also suitable for use in creating stereoscopic images, are prepared by modifying a standard microprism sheet of the type having a plurality of v-shaped grooves. The modifications may include altering the transmission properties of at least one surface of each groove in such a manner that light transmitted in different directions has different properties, for example by attenuating light in one plane and not in the second plane to create a privacy screen, or by altering polarizations in the two planes so as create a stereoscopic effect. The modifications may also include arranging the microprism sheet to interlace images from different sources.

Abstract: Disclosed are a base plate for use for a lens sheet that can realize the unlikeliness to be cracked while the self-sustenance of the lens sheet is being maintained, the lens sheet, and a projection screen comprising that lens sheet. In a base plate, the base plate constructing a lens sheet as a base sheet for a UV-curable resin layer by being bonded to the UV-curable resin layer and being made of ductile materials, the breaking flexure by bending of the ductile material is 0.08 or more; and the Izod impact value thereof is 5 KJ/m2 or more. Also, in a base plate consisting of fragile material, there is used a material that has respective physical properties wherein when it is assumed that F (MPa) represents the shearing force of the UV-curable resin; h (m) represents the thickness of the base plate; E (MPa) represents the bending modulus of elasticity of the fragile material; and &ohgr; (dimensionless quantity) represents the breaking flexure by bending, the relationship of F/hE&ohgr;<1.5 holds true.

Abstract: The present invention is a screen, such as is used in back-lit projection screens, having a Fresnel lens laminated to another layer for support. The screen includes a Fresnel lens having an output surface, and a dispersing screen supportingly attached on a first side to the output surface of the Fresnel lens.

Abstract: Projection screen assemblies include one or more birefringent retarding layers and one or more polarizing layers. The retarding and polarizing layers reduce the unwanted reflection of ambient and image light. One embodiment of a screen assembly includes a dispersing layer having an input side to receive light from a light source and a first retarding layer disposed to alter the polarization of the light transmitted by the dispersing film. A first polarizer substantially transmits light received from the first retarding layer in a first polarization state and absorbs light received from the first retarding layer in a second polarization state orthogonal to the first polarization state.

Abstract: The present invention is concerned with an optical sheet to be used as a screen on which an image is projected from an image projector. The optical sheet is produced by joining a plurality of optical sheet members with end surfaces thereof met each other as joint surfaces. The optical sheet members are realized with lenticular lens sheets. The lenticular lens sheet has lenses, which are elongated in a second direction, juxtaposed in a first direction orthogonal to the second direction. The optical properties of the optical sheet members that are slightly undulated vary cyclically in the first direction. Herein, the optical sheet members to be joined are a selected pair of optical sheet members whose undulations are substantially identical to each other or symmetrical to each other with respect to the joint surfaces.

Abstract: For providing a rear-projection type display apparatus, and a translucent type sheet for use therein, in particular, using an image modulation element, such as, a liquid crystal or a DMD (Digital Micro-mirror Device), etc.

Abstract: The present invention is a screen, such as is used in back-lit projection screens, having a Fresnel lens laminated to another layer for support. The screen includes a Fresnel lens having an output surface, and a dispersing screen supportingly attached on a first side to the output surface of the Fresnel lens.

Abstract: A lenticular lens sheet has arcuate-shaped warping such that the optical output lens side is the concave side, where, considering a chord B1 that connects points P2 and P3 to each other which are points on this approximate curve of arcurate shape and are of distance 150 mm from center line CL, and between which a distance is 300 mm, a distance to this chord B1 from the point P1 where this approximate curve and this center line intersect is represented by S0, and, considering a chord B2 that connects an upper edge UE of this approximate curve to a point P4 300 mm from the upper edge in the downwards direction, a distance to this chord B2 from the point P6 where the perpendicular from the central point P5 of this chord B2 intersects this approximate curve is represented by S1, and, considering a chord B3 that connects a lower edge LE of this approximate curve to a point P7 300 mm from the lower edge in the upwards direction, a distance to this chord B3 from the point P9 where the perpendicular from the central

Abstract: In order to display the image from the projector, the image display system includes the blinds installed in front of the window and consisting of Yupo tracing film, transparent acryl, and coating vinyl which are attached to each other and enable to display image, and a projecting unit such as a slide projector or an LCD projector for projecting image to the blinds such that the image from the projector in a building can be displayed on a rear surface of the blinds through the window out of the building so to give effect of transferring information and providing advertisement and publicity.

Abstract: A micro-lens array sheet having a wide field angle, a field angle control, a high light efficiency, a high brightness and a high contrast, which is provided with a layer of micro-lenses each shaped to be a centro-symmetry convex or concave micro-lens. A layer of either a light diffusion sheet or a sheet filled with light diffusive agent is attached on a light transmitting side of the micro-lens array sheet. The micro-lenses are aligned in a diamond grid array or an array including a combination of diamond-shape and hexagonal-shape micro-lens blocks.

Abstract: There is provided a collimating plate including a transparent support, a multiple of light transmitting spheres fixed to the support in partial contact therewith and a light blocking area that blocks passage of light through areas other than light transmitting areas composed of areas of contact between the support and the spheres and nearby areas. There is also provided a backlight system including the collimating plate and a housing that is optically closed by the collimating plate and that includes an inner surface having reflecting properties. They can produce adequately convergent collimated light the intensity of which drops by 50% at angles of no more than ± 15 degrees, thereby realizing a liquid-crystal display that can provide a sufficiently good contrast ratio over a wide range of viewing angles to be advantageously used in medical applications.

Abstract: A reflection plate is provided which includes a reflection film having a flat reflection surface, and an optical film provided thereon. The optical film serves to converge and emit light which has entered therein, in a direction toward an observer. The optical film has first optical interfaces, which are provided to be inclined to a first direction with respect to a normal line of the reflection surface and to reflect or refract entering light, and second optical interfaces, which are provided to be inclined in a direction opposite to the first direction and to reflect or refract entering light. In addition, the optical film has an emission surface from which reflection light from the reflection surface and reflection light and/or refraction light from the first and second optical interfaces are emitted. A groove having a triangular cross-section is formed in the back surface side defined by the first and second optical interfaces.

Abstract: An optical device that modifies a conventional anisotropic lens array to enable the viewer to perceive a repertoire of preselected images over a first range of angles of regard or to see through the device to a scene beyond the device without distortion. The preselected images in one orientation gives the illusion of a repertoire of images at differing depths. The preselected images at a second orientation can produce a set of optical effects wherein one image gradually transforms to another, or the repertoire of images are unrelated and change suddenly one to another or the repertoire of images are frames of a motion scene or finally, the repertoire of images represent a scene at differing magnifications. The optical device provides distortion-free windowing and a reasonably rich repertoire of images. The device may also be applied to applications requiring optical anisotropy such as privacy filtering.

Abstract: A screen is disclosed for viewing depth of field images. The screen includes a prismatic screen mounted between a flat image and a viewer. Additional optical elements may be provided to enlarge a viewed image. A light hood may be provided to reduce glare and other effects of ambient light. Coating the screen with an anti-reflective coating may provide further protection from ambient light. Restructuring the image into smaller image elements provides image quality for a video image or the like. An aspherical lens may be used to minimize or remove distortion of the image perceived by a viewer to the side, above or below the center viewing axis of the screen. The present invention may find particular application in computer monitor systems, medical and obstetric imaging such as sonograms, musculo-skeletal imaging, vascular imaging, angiograms, angioplasty, dental probes, catheter probes, ear probes, endoscopy, laparoscopy, pelviscopy and arthroscopy.

Abstract: A brightness enhancement film essentially comprises a base and a brightness layer. A brightness layer is molded to create a plurality of prisms in the molding process. Then the brightness layer is adhesively attached to the top surface of the base before the curing process so as to form the brightness enhancement film. Therefore, the top surface of the brightness layer and the bottom surface of the base respectively define the top surface and the bottom surface of the brightness enhancement film.

Abstract: A rear projection screen assembly is described that includes a diffuser and a polarizer. The diffuser has particles dispersed within a binder. The particles and the binder have different refractive indices and are chosen such that the diffuser spreads light of an initial polarization state a cone of angles while substantially preserving the initial polarization state of the light. The diffuser also substantially depolarizing a portion of the light that is laterally scattered in the diffuser. The polarizer is disposed to receive light transmitted through the diffuser. The polarizer transmits light of the initial polarization state while absorbing a portion of the laterally scattered light that has a different polarization state. The resolution of the overall screen assembly may be made higher while also improving other characteristics of the screen assembly.

Abstract: A screen is disclosed for viewing depth of field images. The screen includes a prismatic screen mounted between a flat image and a viewer. Additional optical elements may be provided to enlarge a viewed image. A light hood may be provided to reduce glare and other effects of ambient light. Coating the screen with an anti-reflective coating may provide further protection from ambient light. Restructuring the image into smaller image elements provides image quality for a video image or the like. An aspherical lens may be used to minimize or remove distortion of the image perceived by a viewer to the side, above or below the center viewing axis of the screen. The present invention may find particular application in computer monitor systems, medical and obstetric imaging such as sonograms, musculo-skeletal imaging, vascular imaging, angiograms, angioplasty, dental probes, catheter probes, ear probes, endoscopy, laparoscopy, pelviscopy and arthroscopy.

Abstract: An image projection beam transmission apparatus includes a sheet of optical bulk material having a planar material exit surface and an optical surface. An optical axis is substantially perpendicular to a plane defined by said optical surface. The optical surface comprises a matrix of focusing lens units. Each focusing unit has separate and distinct optical refracting curvature in both a first principle axis, which is perpendicular to the optical axis and a second principle axis, also perpendicular to said optical axis. The first principal axis is perpendicular to the second principal axis. Each of the optical focusing elements is disposed in substantially contiguous and integral relation, and repeats along the first and second principle axes.

Abstract: This invention provides an optical pointing device, such as those used to control devices such as televisions, VCRs, video games and computers, which have improved accuracy and lower sensitivity to detrimental effects, such as noise and user hand unsteadiness, than prior art devices. Such pointing devices emit light beams, such as infrared light, which when received by a receiver are used to position cursors or other symbolic shapes, such as sliding volume controls. An advantage of the pointing device of the invention is that light emitting diodes of conventional manufacture, known to have poor optical precision and hence variable angular emission profiles, may nevertheless be used in the pointing device of the invention.

Abstract: A motor vehicle indicator light comprises a light source, a reflector defining an axis on which the light source lies, the reflector having striations in a first orientation, and an optical plate having striations in a second orientation substantially at right angles to the first orientation. A central zone of the reflector spreads the light in a first direction in a first angular gap defined on either side of the axis, while the striations in two side zones of the reflector spread the light while directing it towards the axis of the reflector in the first direction. A homologous central zone of the optical plate, which may be an intermediate screen, spreads the light in a second direction substantially at right angles to the first direction, in a second angular gap on either side of the axis, while homologous side zones of the intermediate screen spread the light in the second direction to a lesser extent than the central zone.

Abstract: Various forms of light-diffusing screen are disclosed comprising plastics sheets having surface texturing of some kind, adding to or modifying the diffusing effect. The plastics sheets may have bulk diffusing characteristics in addition to the surface texturing. The surface texturing may be produced by, for example, embossing or by molding the plastics against a textured surface such as a "brushed" surface or a ribbed or grooved surface imparting asymmetrical diffusion characteristics to the screen.

Abstract: A method for mass-producing eccentric Fresnel lens sheets comprising the steps of: preparing a number of concentric Fresnel lens sheets; dividing the concentric Fresnel lens sheets into a first set and a second set each including a plurality of Fresnel lens sheets; cutting out a plurality of first sheets each corresponding to one portion of the eccentric Fresnel lens sheet from each of the Fresnel lens sheets of the first set; cutting out a plurality of second sheets each corresponding to the other portion of the eccentric Fresnel lens sheet from each of the Fresnel lens sheets of the second set; and bonding each of the first sheets and each of the second sheets in such a manner that patterns on the first sheet and the second sheet are continuous to prepare a plurality of eccentric Fresnel lens sheet. The second set can include a third set and a fourth set and a plurality of third sheets are cut out from the third set and a plurality of fourth sheets are cut out from the fourth set.

Abstract: A lenticular optical system is described in which a composite image is viewable through a lens sheet from a first angle and an object or image placed at a preselected distance beneath the composite image is viewable from a second angle. Optical designs and alignment processes are disclosed which make possible the economical production of thin materials which facilitate the manufacturing and utilization of the optical system in packaging and the like.

Abstract: A compact teleconferencing eye contact terminal that can be integrated with a multitude of image display devices. Eye contact is achieved between conferees who share similar eye contact terminals by the use of a uniquely configured integral beam-splitter. The beam-splitter is coated over all or part of its surface so that a region acts as a partially-silvered mirror. The beam-splitter is integral to a transparent substrate member that is configured with subtle curves that permit only a portion of its surface, forming the integral beam-splitter, to be angled at or near 45 degrees from the viewing surface of a display screen. By doing so, the angled portion forming the integral beam-splitter is seamlessly suspended in front of the viewing surface without interfering with the viewing. This uniquely configured beam-splitter permits image capturing without the great increase in depth of terminals or loss of display brightness necessitated by prior art eye contact systems employing partially-silvered mirrors.

Abstract: A rear projection type display system with a transmissive screen. A transparent reinforcing plate is coupled to a lenticular sheet of the screen on the light output side by a connective member to broaden the horizontal diverging angle by 60 degrees or more to the right and left sides. The duty factor of a black stripe formed on the lenticular sheet is set to 60% or more so improve the contrast of an image. The diverging angle at each point of a vertically-diffusing lens for diverging light in the vertical direction is modulated in accordance with the height of each point to offer a proper visual angle range in the vertical direction.

Abstract: A viewing screen for incident light including a sheet of embossable material in which a first micro-sculpted surface relief structure that controls the direction in which light propagates has been formed by replicating in the sheet of embossable material a second micro-sculpted surface structure that controls the direction in which light propagates, the second micro-sculpted surface structure having been formed in a photosensitive medium having a refractive index by (i) generating random, disordered and non-planar speckle in the photosensitive medium with coherent light which has been diffused through a holographic diffuser so as to define non-discontinuous and smoothly varying changes in the refractive index of the photosensitive medium which scatter collimated light into a controlled pattern with smooth brightness variation and (ii) developing the photosensitive medium, the incident light being incident on and returned from the viewing screen to a viewing area, the viewing screen controlling the direction o

Abstract: A projection display apparatus comprises a compact CRT, a projecting lens for projecting an enlarged image of the CRT, a Fresnel lens having a converging effect, a lenticular sheet as a diffusing plate. An image that has been enlarged by the projecting lens and passed through the lenticular Fresnel lens is formed on the lenticular sheet. The apparatus further comprises a displacing mechanism for displacing the Fresnel lens, and a display mechanism for displaying information related to the direction and extent of displacement of the Fresnel lens displaced by the displacing mechanism.

Abstract: Our video-conferencing system comprises stations which are remotely located from one another and interconnected by a transmission system. Each station includes a camera, a projector, and a screen, which is simultaneously translucent with respect to the projector and transparent with respect to the camera. The projector as well as the camera are placed behind and in line with the screen, thus allowing greater viewing reciprocity and eye-contact and projecting a stronger feeling of reality to the video-conferencing parties. Our screen includes segments which discriminates between projected light and light to be captured by the camera based upon polarization or angle.

Abstract: A projection system for pictures and a projection display apparatus which are designed to improve the luminance and contrast of a magnified picture on a projection screen by increasing the luminous flux projected within the effective size of projection optical systems. The projection display apparatus has a picture compression device for compressing the aspect ratio of the source picture formed on the face plate panel (PNL) of a projection cathode-ray tube (PRT) or a liquid crystal panel (LCP) to make it substantially 1 and an optical system for extending a picture (EXT) for extending the source picture having the same aspect ratio as that of the original picture. With this construction, the whole luminous flux passing the effective size of the projection optical system is maximized with the effect of improving the luminance and contrast of the magnified pictured projected onto the projection screen.

Abstract: Improved screen for the reproduction of three-dimensional images, static or moving, and a method for manufacturing it. The screen is characterized in that the frames of cylindrical lenses are optically convergent and/or divergent; both frames of cylindrical lenses are formed by cylinders of semi-circular cross-section, juxtaposed in their axial direction, and are arranged on one or both faces of the screen, with the possibility of checking A) that the angle alpha between the two frames is equal to 90.degree., the frame of vertical cylindrical lenses then being covered by a transparent substance with a refractive index n'; or b) that this angle is less than 90.degree.; or c) that this angle alpha is less than 90.degree., and that the frames of cylindrical lenses are covered with a substance with a refractive index n". The method involves: a) preparing a first mould; b) producing a counter-mould; c) producing a final mould; and d) moulding the frames by pressing with the final mould.

Abstract: An array of optical microelements is produced by press molding, at a high temperature, a transparent glass with a press mold which has a molding surface formed into a shape corresponding to the optical microelement array and coated with a chemically stable thin film.

Abstract: A polarizing screen for visually presenting a picture in response to receipt of projected imagewise rays of light having a polarizing fabric overlaying a first surface of the screen base facing a viewer and operable to pass therethrough the projected imagewise rays of light having the first polarizing direction, but absorb rays of light having a second polarizing direction. The polarizing fabric includes a plurality of juxtaposed polarizing fibers and a plurality of juxtaposed non-polarizing fibers interlaced with the juxtaposed polarizing fibers so as to extend perpendicular to said juxtaposed polarizing fibers. Instead of the polarizing fabric, a non-woven sheet having the polarizing fibers juxtaposed thereon may be used.